Hello all, Please let me know if I should be posting just general OO stuff somewhere else, but I figure that this might be relevant to a lot of procedural programming types just jumping into python (and the example is straight out of FEA). Anyways, I have the following code below. The problem is, I need to be able to instantiate many nodes for a given element as well as many elements for a model. Tackling this with built-ins such as arrays, lists and dicts seems straightforward, but I can't wrap my head around it in OO for some reason. Do I just need to make my element and node inherit from a list and then use the ".append()" when I instantiate it? Any help greatly appreciated. Thanks, Ben Racine """ untitled.py Created by Ben Racine on 2008-11-21. Copyright (c) 2008 __MyCompanyName__. All rights reserved. """ import sys import os class model(object): """docstring for model""" def __init__(self): pass class element(object): """docstring for element""" def __init__(self): pass elementID = 'something' elementPressure = 'something else' nodeCount = 'something else altogether' class node(object): """docstring for node""" def __init__(self): pass nodeID = '1' x = 'xx' y = 'yy' z = 'zz' if __name__ == "__main__": test = model()